If you have 5 questions and get an 80% how many questions did you get wrong?

The parabola x= √y-9 opens: a.)up b.)down c.)right d.)left

2x minus y equals 6, x plus y equals negative 3

Tamar is measuring the sides and angles of tuv to determine whether it is congruent to the triangle below. which pair of measurements would eliminate the possibility that the triangles are congruent